body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #f4f4f4;
  color: #333;
}
header {
  background: #2c3e50;
  color: #fff;
  padding: 1rem 0;
  text-align: center;
}
main {
  padding: 20px;
  max-width: 800px;
  margin: auto;
  background: #fff;
}
footer {
  text-align: center;
  padding: 10px;
  font-size: 0.9em;
  background: #eee;
}
a {
  color: #2980b9;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}